I am using this list as my reference to find GPRS MVNOs. I know
T-Mobile still does GPRS, I am less certain about AT&T (I assume yes as
https://uppwireless.com/ is tempting at $15 for 1GB monthly
BUT the Uppwireless says "Mobile Internet service provided by Red Pocket
Mobile", which is listed as an MVNO working with both AT&T and Sprint.
Sprint = CDMA.
$15 a month for 1GB on AT&T would be great for our application
(http://www.wi-flight.net), for uploading only data (the voice portion
of our product would upload over Wi-Fi or perhaps over Voice GSM).
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